If you want more traffic to your site or want to better understand what your market is looking for you should explore Wordtracker.
Keyword Planner helps you research keywords for your Search campaigns. You can use this free tool to discover new keywords related to your business.
A useful tool to indentify terms you should be using with yor blog posts
Google/Youtube/Bing/Amazon/eBay/Play Store/Instagram/Twitter
Batch query Google keyword search volume, the feature is: batch query, free
Find long tail keywords with low SEO difficulty
A highly recommended keyword mining tool that can help you dig out a lot of long-tail keywords